NHP Electrical Engineering Products and Sprecher + Schuh have recently introduced the newest addition to the DeviceNet ready, CEP series of electronic motor protection relays, the CEP 7 C3.
Having all of the features of the C2, the Sprecher + Schuh CEP 7 C3 has added external ground fault protection capabilities, utilising core balanced transformers.
External ground fault CTs are available from 20mm to 185mm window sizes. The same ground fault CTs can be used with the lower cost CEP 7E ground fault modules. The CEP 7 C3 version allows sensitive earth fault detection within the adjustment range of 20mA to 5A.
The CEP 7 C3 electronic overload relay not only helps protect the electric motor investment but can proactively assist in maintaining the electric motor by limiting the number of starts and operating hours.
The CEP 7 C3 electronic overload relay can also help provide diagnostic and metering information to help the user understand the consumption patterns for the motor or process by providing the following:
- RMS current
- Percentage of full load current (% FLA)
- Current imbalance
- Thermal Capacity Utilisation (% TCU)
- Trip log
- Warning log
The CEP 7 C3 electronic overload relay measures current usage for an electric motor including the following:
- L1, L2, L3, and average RMS current
- L1, L2, L3, and average % Full Load Amperes (%FLA)
- Ground fault current
- Current unbalance
These parameters can be historically collected to provide the user with a better understanding of the following:
- Loading patterns
- Energy usage
- Power quality
- Equipment maintenance
The CEP 7 C2/C3 electronic overload relay internally records the last five trips and last five warnings. More protection means less downtime and greater safety to the motor and personnel.